Both the Kirban and the Houston DP's would be a lot better than the stock one, but the THDP is definately the best....however the difference in price between the two makes the Kirban a very attractive alternative.
I have a SS 3" Kirban DP with test tube that was used for only one week (still looks brand new) that I will sell for $150 shipped to anywhere in the US. Complete with all the hardware and instructions. I just got a KMDP and this is why I am selling the Kirban.